[K12OSN] LTSP on same network as Windows

[Huck]

Yes...
TuxMath is what I used to bring my network to a screeching halt on 25 
machines...
It became possible to do the square root, subtraction, multiplication, 
addition, division, of the 2 numbers floating down before they would 
crash into the city...
that was fun none the less just to see how close to death the network 
would come...

--Huck

Terrell Prudé, Jr. wrote:

> Agreed.
>
> The problem here is when some teacher wants to use an application like 
> TuxType or TuxMath, and we get to seeing that 73Mb of used bandwidth 
> per workstation (my analysis results are in the archives--mid to late 
> January 2004, I think).  I agree that, for apps like OO.o and Web 
> surfing, even 10Mb half-duplex is usable; I do this on old PMacs with 
> KDE.  However, anything that does a lot of screen updates is going to 
> be brutal on 10Mb, possibly even unusable.
>
> Let's see...you're instructing fifteen 3rd or 4th graders with 
> TuxType, times 73Mb/sec BW usage.  That comes to 1,095Mb/sec, or just 
> over 1Gb.  Now I've got to remember that my computer labs have 25 or 
> more stations in them.  Yikes!
>
> As always, it depends on your application.  In high schools, I don't 
> see this issue mattering as much, more like a business.  In elementary 
> schools and some middle schools, though, it could.
>
> --TP
>
> Jim McQuillan wrote:
>
>> guys,  Don't lose sight of the fact that one of the important things to
>> think about is "Expected level of performance".
>>
>> I'm seeing recommendations of gigabit uplinks for more than 10 clients.
>>
>> I've got 140 thin clients on a single network.  about 60 of those are
>> running at 10 mbit/sec, while the rest are running at 100 mbit/sec.
>> No gigabit, anywhere on the network.
>>
>> And...... The performance is fine.  They aren't running fancy multimedia
>> apps, but they are doing OpenOffice and Mozilla, and a bunch of Xterms.
>>
>> Now granted, this is a business installation, and schools are a bit more
>> demanding, but it is still amazing how many thin clients you can run
>> with fairly modest hardware and networking infrastructure.
>>
>> If you are in a position where you are starting out with all new
>> equipment, then you might as well go for the gigabit network.
>>
>> But, if cost is really an issue, and you are using existing hardware,
>> don't be afraid to just set it up and use it.  The performance will
>> likely be adequate.
>>
>> In most cases, people are plenty happy to have any computers at all,
>> even if they aren't the fastest computers available.
>>
>> Jim McQuillan
>> jam at Ltsp.org
>>
>>
>> On Sat, Aug 21, 2004 at 04:52:52PM -0500, Les Mikesell wrote:
>>  
>>
>>> On Sat, 2004-08-21 at 15:04, Yancey B. Jones wrote:
>>>
>>>   
>>>
>>>> I have installed gigabit switches on each floor with full 
>>>> compliance CAT5E
>>>> cable running to the server room. We are looking at about 50-75 
>>>> thin clients
>>>> spread throughout the school. I can add separate switches if 
>>>> necessary, I
>>>> just want to make sure that it is necessary before I ask for them. The
>>>> entire network will consist of approximately 100 Windows XP Pro 
>>>> clients for
>>>> students, 50 Windows clients for teachers/staff, and eventually 
>>>> about 75
>>>> thin clients.
>>>>     
>>>
>>> Gig uplinks from the server and a gig backbone across switches
>>> sounds like enough.  The client nics will probably be 100M
>>> anyway.
>>>
>>>   
>>>
>>>> The thin clients will be in "clusters" of 3-4 and I am planning on 
>>>> using a
>>>> 5-port 10/100 switch at each "cluster" to reduce the number of 
>>>> cable runs.
>>>>     
>>>
>>> Still should be OK - at somewhere around 10 clients you might want
>>> a switch with a gig uplink.
>>>
>>>   
>>>
>>>> We will install one LTSP server at first,
>>>> when we reach capacity on that one then we will put a second one 
>>>> in. Will a
>>>> need a separate network for each LTSP server or can the be load 
>>>> balanced
>>>> somehow?
>>>>     
>>>
>>> The 'thin client lab' might be the place to drop the 2nd server
>>> since it would be convenient to isolate that traffic with a
>>> 2-NIC setup and separate switch.  Are you going to have a
>>> separate server for home directories?  That way they could be
>>> samba-shared to the windows clients without additional load on
>>> the k12ltsp server and it will make it easy to add the 2nd
>>> ltsp server.
>>>
>>> ----
>>>  Les Mikesell
>>>    les at futuresource.com
>>>
>>>
>>>
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>>>   
>>
>>
>>
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>>  
>>
>
>